Projectile.



relatively hard metalrfor` en agementwith 'effecting the rotation 4of the projectile by UNITED STATES PATENT OFFICE.

ROBERT w. scoTT, 0E LEEDS PONTNE'W JEEsEY,AssIGNoR,BY DIRECT AND MEsNE ASSIGNMENTS,.TO SCOTT 6c WILLIAMS, INCORPORATED, OF

A CORPORATION O15'Y NEW JERSEY.

PROJECTILE.

OAMDEN, NEW JERSEY,

"Patented Dec. 19, 1911.

Application led J'uly 6, 1909.` Serial No. 506,101. I

To all whom 'it may concernl Be it known that I, ROBERT W. SCOTT, a citizen of the United States-'residing in Leeds Point, Atlantic county, New Jersey,- have invented certain Improvements in Projectiles, of which the following isa specilication. 1 i My invention relates to that class of projectiles in which a mantle of relatively hard metal envelops a. dense and heavier; core of softer metal, the object of the mantle being to secure penetration, to maintain vtrue dight; to preventdeformation of thejtrue'l-forn` of the projectile, to producea clea'nwourid,l and to cause the desiredrotation "of th'efp'loi` jectile in its passage through tli'ebzii'rel-ifl the dre-arm by reason ofthepre'sence'ltofa'u the riding of thebarrel'. rdinarilyjffthe'j mantle covers the lsofter metal coreffrom tip to base, but in- Letters lPatentV No. 733,920; granted to me on the 14th day of July, 1903,1 I described a projectile having aimantlev which was discontinued 'some distance in ad-' vance of the base of the soft metal core;v the object being to provide the hardermetal for engaging the riding andimpartingrotating movement of the projectile together with an exposure of the soft metal core at the base of the projectile and beyond the rear end of the mantle where it could 'be expanded by the pressure of the exploding gases so as to serve as a check to prevent escape of gas between the projectile and the barrel before the inertia of the projectile was overcome.

In the patented projectile that portion of the soft metal core which projected bekhind the harder metal mantle simply acted as a follower and performed no function inAV engagement with the riding of the barrel, such rotation being caused wholly by the engagement of the riding with the hard metal mantle.

In projectiles intended for use in that class of dre-arms in which the projectile has not such a high velocity as that contemplated in the case of the patented projectile, such, for instance, as ordinary pistols and revolvers, that portion of the soft metal core which projects beyond the rear of the mantle may be caused to act not only ing the mantle either wholly or in part from its duty of causing rotating'movement to the projectile, and it is to proj ectilhs of t-he 'latter' class that `my present invention relates. y

` In the accompanying drawing Figures l, v 2 and 3;are exaggerated sectional views illustrating diderent projectiles embodying my invention..v` y Y l i p -Inthe drawingsfl' represents the soft metalbody -or core'of the'projectile and 2 5 the mantle of harder metal Awith which the for/'Ward portion of said soft metal body or corejgr--is fprov'ided o v 1f .'Injthe projectilegshowninFig. 1` the mantlezhas-a-cannelufeadapted to a recess -in .thefisoft metalfcore so; asfto'lprevent any {accidentalremoval of Athel :mantle from the icore,I andjvin -the'rea'r of this cannelure the mantle-isf dared foutwardly' as at 4, so that '.whilefthe ff0rward-1portion of the mantle only the barrel between the inner faces of -the'lands ofthe'riding the base of the vmantle ils of such'a diameter as to reach the bottoms 4ofthe grooves of said riding, and the projecting rear portion 5 of the soft metal core is of the same diameter. When i this projectile is fired there is a certain longitudinal upsetting of the soft metal core due to the pressure of the gases of explosion against the rear end ofF the same, and this will be attended by an expansion of the daring rear portion 4 of the mantle 2, so that as a gas check butalsoas a means of relievthe riding will be engaged not only by the j .projectingbody of soft metal at the rear of the projectilebut also by more or less of the, rear portion of the harder metal antle and the rotation of the projectile will be due to the action of the riding upon .these two different metallic bodies, the e1;- pansion of the soft metal base of the projectile also causing it to serve as a gas check as in my patented projectile'before alluded to. Owing to the limited area of the mantle 'in contact with the riding, and to the fact that such contact portion 1s readily collapsible, no undue wear of the riding will result.

Instead of providingy themantle with a daring rearend to be expanded by the pressure of the soft metal core thereon when the projectile is fired, said mantle may, in the drst instance, be expanded 'Vfor a certain distance in advance of its rear end, as shown at 6 in Fig. 2, to provide a portion for enaging the rifling, this enlargement being also collapsible because of the absence of anyinternal stidening rib or ange thereon.

In some classes of projectiles the mantle may, throughout, its entire length, be of such a diameter as not to engage the riding, such a projectile being shown in Fig. 3. The rotation of this projectile is due entirely to the action ofthe riiing upon the rear portion of the soft metal core which is of sufciently greater diameter than the mantle to insure such engagement, and is preferably so formed at the front end as to present a beveled shoulder 9.

`It is important that the mantle shall be A imperforate for the impact of the projectile and the shock of explosion causes upsetting and lateral expansion of the soft metal core, and where the mantle covers only so much of the core as it does in the present form of projectile this upsetting action would cause the soft metal core to emerge to a greater or less extent from any perforations in the mantle, thus forming studs, burs, or fins upon the outside of the mantle which would f cause erratic iiight, and interfere with the penetration of the projectile and would result inthe productlon of ragged wounds. In orderto prevent the formation, from the same cause, of any fin at the junction of the base of themantle and the forward portion of the projecting soft metal rear of the projectile, I prefer to chamfer the inner side of the mantle at the base, as shown at 7, whereby the tendency of a bodily forward movement of the rear portion of the soft metal core is to force the metal inwardly instead of outwardly.

-I claim:

1. A projectile having a soft metal core and an imperforate mantle of harder metal discontinued in advance of the rear end of said core, said mantle having a tapering nose, and, in the rear of the same, a straight portion of such diameter that it will not engage the rifling of the barrel, that portion of the core in the rear of the mantle being of such diameter vas to engage the rifling and rotate or aid in rotating the projectile.

2. A projectile having a soft metal core and a mantle of harder metal, said mantle having a tapering nose, and, in the rear of the same, a straight portion of such diameter that itwill not engage the riiing of the barrel, the rear portion of the mantle being expanded so as to cause such engagement' and the soft metal core providingan' unyielding support for said expanded portion of the mantle. f

3. A projectile having a soft metal core and a mantle of harder Ymetal having a tapering nose, and a straight portion in the rear of the same of s uch diameter that it does not engage the'rifling of the barrel, the

mantle having a flaring base portion for-engaging the ritling and the soft metal corev providing an unyielding bearing for said flaring base or mantle. c

4. A projectile having asoft metallcorev and a mantle of harder'.metal-havinggaHarl ing base portionand a cannelure in advance 5. A projectile having a sotainetal-.fcore and a mantle of-hardermetalwhoseforward portion does not.engagethey rijiin`g,{said,r

mantle being expandedatathebasessosdiof l effect such engagemen #and tliegsoft:- etalr core being continued lrearwardly beyond the base of the mantle 1 and lserving ,also fenf. f

gage the riiing, whereby'thegrotationof alle` projectile is due lto such joint engagement. 13

6. A"projectile havingav-soft metal-:core and a mantle of harder metal 4discontinued- -in advance of the base ofthe core, said ex-` posed portion of the core having -at its forward end a beveled 4shoulder whose outer portion 'is flush with the sides ofthe follow-' ing portion of the core.

In testimony whereof, I have signed my name to this specification, 1n the presence of two subscribing witnesses.

ROBERT W. SCOTT. i Witnesses: y

HAMILTON D. TURNER, KATE A. BEADLE.

copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

